Means for securing units consisting of a shear blade and its mounting to the saddlesof sheet-metal shears



Aprll 11, 1967 G. BOLLIG 3,313,195

MEANS FOR SECURING UNITS CONSISTING OF A SHEAR BLADE AND ITS MOUNTING TOTHE SADDLES OF SHEET-METAL SHEARS Filed Jan. 26, 1965 United StatesPatent Ofifice 3,313,195 Patented Apr. 11, 1967 3,313,195 MEANS FORSECURING UNITS CONSISTING OF A SHEAR BLADE AND ITS MOUNTING TO THESADDLES F SHEET-METAL SHEARS Georg Bollig, Dusseldorf-Oberkassel,Germany, assignor to Schloemann Aktiengesellschaft, Dusseldorf, Germany,a German company Filed Jan. 26, 1965, Ser. No. 428,106 Claims priority,application Germany, Feb. 8, 1964, Sch. 34,612 4 Claims. (Cl. 83-698) Insheet-metal (or plate-cutting) shears it is known to secure the units,each consisting of a blade and its mounting, in the shearing-machinesaddles, by means of screw-threaded bolts and nuts. To change theblades, these conections have to be released in each case by hand.

A sheet-metal shearing machine has also already become known, in which,on the ledge of the mounting, shoulders are provided, which can beinserted into slots in the shearing-machine saddle, and can be held fastin the inserted position by a screw-threaded bolt extending in thedirection of shearing. This device also requires manual work infastening and releasing the mounting. The bolt thread is sensitive tocontamination and to damage.

The object of this invention is to provide an automatic securing meansfor the blade units to the lower and upper shearing-machine saddles, soas to shorten the duration of stoppage of the shearing line whenchanging the blades.

This is attained, according to the invention, by providing, on the shearsaddle, hydraulically acting fastening means on both sides of amounting, which is supported in the direction of the shearing pressureacting perpendicularly upon the blade, and also in the direction of thechewing pressure, which acts horizontally upon the front of the blade.By this arrangement of the fastening means in relation to theirdirection of action, and by the inclination of the surfaces by which thefastening means engage the mountings, a component of the holding forceis provided which is in the same direction as the chewing pressure.

According to a further feature of the invention, cylinders connectedwith a source of liquid under pressure are horizontally arrangedlaterally on the upper shearingmachine saddle, the pistons slidable inthese cylinders being connected in each case with a set bolt or tensionbolt provided with a recess, there being associated with each of theseset bolts a shoulder, corresponding to the recess, on the mounting, therecess and the mounting shoulder being correlated with one another, onthe scrapblade side, by an inclined surface.

According to a further feature of the invention, there are guided, inthe lower shearing-machine saddle, bolts directed towards the mounting,which are connected with the slidable pistons of cylinders flangedlaterally on to the shearing-machine saddle and communicating with asource of pressure liquid. Of these cylinders the one arranged on thescrap-blade side is of smaller crosssectional area than the oppositeone, the bolt ends and the mounting engaging one another by inclinedsurfaces.

In this way a blade-fastening is provided in which the securing meanscan be automatically removed from the lifting-out region of the bladeunits, whereby it is rendered possible to make the entire blade-changingoperation automatic.

One constructional example of the invention is illustrated in theaccompanying drawings, in 'which:

FIGURE 1 shows part of a sheet-metal shearing machine in sectionalelevation, the plane of section being transverse to the blades; and

FIGURE 2 shows a plan of the front portion of the shearing machine, withthe upper part in section on the line IIII in FIGURE 1, at the level ofthe upper blade.

In a sheet-metal shearing machine 1, in a recess of 2 of the movableupper shearing-machine saddle 3, is arranged a mounting 4, which iscombined into a unit with the main blade 5 and the scrap blade 6. To theshearing-machine saddle 3 are secured cylinder-holders 7 and 7', towhich are flanged cylinders 8 and 8', the pistons of which, not shown,are connected with set bolts or tension bolts 9 and 9'. These set boltsare of hook-like construction, and engage over shoulders 11 and 11 onthe mounting 4, and hold the latter firmly against the uppershearing-machine saddle 3 when the piston is acted upon by pressureliquid. The shoulder 11' arranged on the scrap-blade side has aninclined surface, against which there acts the set bolt 9', which isequipped with a surface of the same obliquity, so that even in thedirection of the chewing pressure of the scrap blade 6 a satisfactorybearing contact with the shearing-machine saddle 3 is obtained.

The lower shearing-machine saddle 1 2 accommodates, in a recess 13, amounting 14, with the main blade 15 and the scrap blade 16 connectedtherewith. The mounting 14 has shoulders 17 and 17', each with aninclined surface, upon which a bolt 19 or 19, bevelled at the tip andconnected with the piston, not shown, of a cylinder 18 or 18' is pressedby supplying pressure liquid to these pistons.

The cylinder 18 is of larger cross-sectional area than the cylinder 18',so that in the direction of the chewing pressure of the scrap blade agreater force becomes operative, and a more reliable bearing of themounting upon the shearing-machine saddle 12 is ensured.

I claim:

1. A device for securing units, each consisting of a shear blade and itsmounting, to the upper and lower saddles of a sheet-metal shearingmachine, comprising: a mounting supported on the shear saddle in thedirection of the shearing pressure and the chewing pressure, andhydraulically actuated securing means provided on the shear saddle atboth ends of the said mounting, the co-acting contact surface of the'mounting and of the securing means being at such an inclination that theholding force transmitted from the hydraulically actuated securing meansto the mounting is not purely axial in direction but includes acomponent acting in the direction of the horizontal chewing pressureapplied to the front of the blade.

2. A device as claimed in claim 1, further comprising a scrap bladeaccommodated in each mounting at an angle to the main blade, the axialcomponent of the holding force being directed towards that surface ofthe blade 7' beam which takes up the chewing pressure of the scrap uppershearing-machine saddle, and bolts actuated by the hydraulic cylindersand adapted to engage the upper mounting, the co-acting surfaces of thebolts and the mounting at the scrap-blade end of the mounting beinginclined.

4. A device as claimed in claim 2, further comprising: hydrauliccylinders flanges laterally to the lower shearing machine saddle, andbolts guided in the lower saddle, directed towards the lower mounting,and actuated by the said hydraulic cylinders, the co-acting surfaces ofthe bolts and the mounting at both ends of the mounting being inclined,and the hydraulic cylinder at the scrap blade end of the mounting beingof smaller cross-sectional area than the one at the other end.

References Cited by the Examiner UNITED STATES PATENTS 2,593,144 4/1952Hercik 8370O X 2,984,176 5/1961 Sommer et al 83-698 3,131,589 5/1964Hazelton et a1. 83--640 X FOREIGN PATENTS 971,006 1/1951 France.

10 WILLIAM W. DYER, JR., Primary Examiner.

ANDREW R. JUHASZ, Examiner.

I. M. MEISTER, Assistant Examiner.

1. A DEVICE FOR SECURING UNITS, EACH CONSISTING OF A SHEAR BLADE AND ITSMOUNTING, TO THE UPPER AND LOWER SADDLES OF A SHEET-METAL SHEARINGMACHINE, COMPRISING: A MOUNTING SUPPORTED ON THE SHEAR SADDLE IN THEDIRECTION OF THE SHEARING PRESSURE AND THE CHEWING PRESSURE, ANDHYDRAULICALLY ACTUATED SECURING MEANS PROVIDED ON THE SHEAR SADDLE ATBOTH ENDS OF THE SAID MOUNTING, THE CO-ACTING CONTACT SURFACE OF THEMOUNTING AND OF THE SECURING MEANS BEING AT SUCH AN INCLINATION THAT THEHOLDING FORCE TRANSMITTED FROM THE HYDRAULICALLY ACTUATED SECURING MEANSTO THE MOUNTING IS NOT PURELY AXIAL IN DIRECTION BUT INCLUDES ACOMPONENT ACTING IN THE DIRECTION OF THE HORIZONTAL CHEWING PRESSUREAPPLIED TO THE FRONT OF THE BLADE.